Clue #1:Boat - The cloned meds Niko and Packie are meant to steal are brought to city by a boat.Clue #2: Tactical attack - Niko moves up from ground while Packie protects him up the roof.Clue #3: AK-47 - Packie uses an AK-47 during this mission.

Clue #4: Differences - On the way to Triad facility, Niko and Packie talk about the differences between American and Europen jails (Niko says there's no "fun in the shower", "prison b*tch" things don't happen in Europe).

Clue #5: The first appearance of a mission giver - Ray makes his first appearance in the last scene of this mission.

GroundZero

Flatline? Just noticed I typo'd trespass above which still fits with the new clue (take it we don't have to be precise with the spelling?)

It was just a minor mistake, don't worry about it. Flatline is the correct answer.

Clue #1: Niko must take out someone. (Niko must take out Anthony Corrado.)

Clue #2: There are two ways to approach that person. (Niko can either wear the doctor's outfit and silence him by turning off his life support machine, or he can simply bust in the room without the outfit.)

Clue #3: The mission takes place (mostly) in an interior. (The mission mostly takes place inside the Westdyke Memorial Hospital.)